<template>
  <div class="my-tab-bar">
  	<div class="tab-item" v-for="(item,index) in list" :key="index" :class="{ current: index === activeIndex}" @click="clickFn(index,item.componentName)">
      <!-- 图标 动态class直接跟个字符串变量表示给元素添加此类名 -->
      <span class="iconfont " :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{item.text}}</span>
    </div>
  </div>
</template>

<script>
export default {
  props:{
    list:{
      type:Array,
      required:true,
      //val 就是我们传过来的值 可以返回true和false
      //true代表通过验证 ，false代表未通过验证
      validator(val) {
        if(val.length<2 || val.length > 5) {
          console.error('prop list must between 2 and 5')
          return false
        }
        return true
      }
    }
  },
  data() {
    return {
      activeIndex : 0
    }
  },
  methods:{
    clickFn(index,componentName) {
this.activeIndex = index
this.$emit('changeCom',componentName)
    }
  }
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>